Berlin 2015 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 81: Heterostructures and interfaces
HL 81.4: Vortrag
Donnerstag, 19. März 2015, 15:45–16:00, EW 201
Stability and capping of magnetite ultra-thin films — •Karsten Fleischer, Ozhet Mauit, and Igor V. Shvets — School of physics, Trinity College Dublin, Ireland
Ultrathin films of Fe3O4 have been grown epitaxially on nearly lattice matched MgO(001). The stability of 4 nm thick films in ambient air and under annealing in an oxygen atmosphere at 570K has been studied. By magneto optical and Raman measurements, we can confirm the presence of the Fe3O4 phase and the formation of a maghemite top layer passivating the Fe3O4 thin film. In a second step, we are able to demonstrate that this top layer oxidation in ambient air can be prevented by a 2 nm thick magnesium ferrite passivation layer, while a thicker 20 nm MgO layer prevents oxidation even at elevated temperatures.